Conversion

Enchantment    (CMC:4)

All mountains become basic plains. During your upkeep, pay or destroy Conversion.

4E • ENJesper Myrfors

™ & © 1993—1995 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Conversion {2}{W}{W} Enchantment At the beginning of your upkeep, sacrifice Conversion unless you pay {W}{W}. All Mountains are Plains.

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View this MTG card on Gatherer

10/4/2004
The Conversion effect is a continuous effect. There is no chance to tap a just-played mountain for red mana before it becomes a plains.
10/15/2006
Will not add or remove Snow Supertype to or from a land.

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Card Conversion is not on TCGPlayer.